Thick films of aligned single wall carbon nanotubes and ropes have been pro
duced by filtration/deposition from suspension in strong magnetic fields. W
e measured mosaic distributions of rope orientations in the film plane. for
samples of different thicknesses. For an similar to 1 mu m film the full w
idth at half maximum (FWHM) derived from electron diffraction is 25 degrees
-28 degrees. The FWHM of a thicker film (similar to 7 mu m) measured by x-r
ay diffraction is slightly broader, 35 +/- 3 degrees. Aligned films are den
ser than ordinary filter-deposited ones, and much denser than as-grown mate
rial. Optimization of the process is expected to yield smaller FWHMs and hi
gher densities, (C) 2000 American Institute of Physics. [S0003-6951(00)0513
1-7].